Electrical resistor



y 1934- E. A.. EVERETT 1,956,859

ELECTRICAL RESISTOR Filed Dec. 22, 1930 INVENTOR.

Patented May 1, 1934 UNITED STATES PATENT OFFICE EH'ICTBICAL nssrs'ronEdward a. Everett, Long Island City, N. Y. Application December 22,1930, Serial No. 504,155

7 Claim.

This invention relates to electrical resistors, that is, to a devicewhich is connected into an electrical circuitwith the object ofincreasing the resistance in the circuit. An object of the invention isto provide mountings for a resistant material in a variety of forms andwhich may be conveniently adjusted. Other objects of the invention willappear from the following'specification and the accompanying drawings,in which,

Fig. 1, shows one form of this invention constructed from a plurality ofresistance units in which the resistance may be varied by bringing oneor more units into circuit; Fig. 2 is one form of connector strip thatmay be used to bridge the terminals in Fig. 1; Fig. 3 is an elevation,partly sectioned, corresponding to Fig. 1; Fig. 4 is an end elevation,partly sectioned, corresponding to Fig. 3 and Fig. 5 is a modificationof the arrangement shown in Fig. 1.

The resistor illustrated in the drawings show an adjustable form ofresistor that is built up from multiple units to the capacity desired. Aporcelain base '15 is provided with binding posts 76 and 77 which clampthe connector strips 78 an insulating sleeve 81 and with insulatingcollars 81a at each end so that it is disconnected from the circuit. Onthe sleeve 81 the resistor units 82, 83, 84 and85 are mounted and arespaced by metallic washers 88 and by the upstanding connector strips 86provided with the terminals 87. The end strips 86 are directly connectedwith the supporting strips 78 and 79 and the conductors may be connectedto these outer terminals 87 or to the terminals '76 and 7'7. Theresistance of this device can be varied by bridging over certain of theunits or connecting them in multiple circuit and a connector stripsimilar to 89, Fig. 2 may be used for this purpose.

In order to facilitate these connections the connector strips 86 arerotatably mounted on sleeve 81 and may be deflected as indicated at aand b in Figs. 1 and 4. In this way the termi-' and '79 respectively.The bolt 80 is provided with poses, preferred to resistances of the coiltype. They are mechanically stronger and are not materially injured bylightning discharges nor fused by heavy currents.

Having thus described my invention, I claim:

1. An' electrical resistor comprising a shaft, a plurality of resistorunits mounted on said shaft, a terminal strip mounted on said shaftbetween each of said units and carrying a terminal-screw,

.means for connecting said resistor into an electric circuit and meansfor freely aligning said terminal strips whereby one or more of saidunits may be bridged by a straight bridging piece without interferingwith intermediate terminal strips.

2. An electrical resistor comprising a shaft, a sleeve of insulation onsaid shaft, resistor units mounted on said sleeve, a terminal stripmounted on said sleeve between each of said units and being freelyrotatable thereon whereby any particular pair of terminal strips may beindividual- 1y aligned, a link for connecting said strips and means forconnecting said resistor into an electric circuit. V

3. An electrical resistor comprising a shaft, a sleeve of insulation onsaid shaft, resistor units mounted of said sleeve, a terminal stripmounted on said sleeve to .rotate freely thereon between each of saidunits and having a projecting end bent over at a right angle andprovided with a binding post, a link for connecting'a plurality of saidbinding posts and means for connecting said resistor into an electriccircuit.

4. An electrical resistor comprising a shaft, resistor units mounted onsaid shaft, a terminal strip having a projecting end mounted on saidshaft between each of said units, said terminal strips being similar inform and being freely ro- 'tatable on said shaft whereby any pair ofprojecting ends may be brought into alignment and located to avoid theprojecting ends of the other intervening strips and a link forconnecting said aligned strips.

5. An electrical resistor comprising a shaft, resistor units mounted onsaid shaft, a terminal strip mounted. on said shaftbetween each of saidunits, each of said strips having a projecting portion with a portion ofsaid projecting portion having a terminal screw bent parallel with saidshaft, said strips being freely rotatable on said shaft whereby any pairof terminal strips may be brought into alignment and located to avoidthe other terminal strips and a link secured by said terminal screws forconnecting said aligned terminals.

a pair of L-shaped brackets clamped to said base through slottedopenings in said brackets, a shaft mounted on said brackets, a pluralityof resistant units mounted on said shaft between said brackets andterminal strips mounted on said shaft between said resistant units, saidbrackets being adjustable to the number of said resistant units on saidshaft by changing the position of said L-shaped brackets on said baseand by clamping said brackets through the slotted openings to said base.

EDWARD A. EVERETT.

